powerpc: Fix altivec disabling in set_mcontext()
We somewhat blindly copy the srr1 from the new context to the trap frame, but disable FPU and VSX unconditionally, relying on the trap to re-enable them. This works because the FPU manages the VSX extended FP registers, which is governed by the PCB_FPFREGS flag. However, with altivec, we would blindly disable PSL_VEC, without touching PCB_VEC. Handle this case by disabling altivec in both srr1 and pcb_flags, if the mcontext doesn't have _MC_AV_VALID set. Reported by: pkubaj
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=357607
@ -526,6 +526,9 @@ set_mcontext(struct thread *td, mcontext_t *mcp)
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pcb->pcb_vec.vscr = mcp->mc_vscr;
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pcb->pcb_vec.vrsave = mcp->mc_vrsave;
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memcpy(pcb->pcb_vec.vr, mcp->mc_avec, sizeof(mcp->mc_avec));
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} else {
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tf->srr1 &= ~PSL_VEC;
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pcb->pcb_flags &= ~PCB_VEC;
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}
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return (0);
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